About the guarantee period:

A life annuity with a no guarantee period is payable for the annuitants lifetime and stops upon death.

A life annuity with a guarantee period option is payable for the annuitant's lifetime or for the guarantee period, whichever is longer. If the annuitant dies before the completion of the guaranteed annuity payments, payment may continue to the beneficiaries or the current value of the remaining guaranteed payments will be paid to the appointed beneficiary.